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simple_calculator.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Simple Calculator</title>
</head>
<body>
<h1>Simple Calculator using HTML</h1>
<br>
<form action="" name="calculator">
<table>
<tr>
<td colspan="4"><input type="text" id="display" disabled></td>
</tr>
<tr>
<td><input type="button" value="1" onclick="calculator.display.value += '1'"></td>
<td><input type="button" value="2" onclick="calculator.display.value += '2'"></td>
<td><input type="button" value="3" onclick="calculator.display.value += '3'"></td>
<td><input type="button" value="+" onclick="calculator.display.value += '+'"></td>
</tr>
<tr>
<td><input type="button" value="4" onclick="calculator.display.value += '4'"></td>
<td><input type="button" value="5" onclick="calculator.display.value += '5'"></td>
<td><input type="button" value="6" onclick="calculator.display.value += '6'"></td>
<td><input type="button" value="-" onclick="calculator.display.value += '-'"></td>
</tr>
<tr>
<td><input type="button" value="7" onclick="calculator.display.value += '7'"></td>
<td><input type="button" value="8" onclick="calculator.display.value += '8'"></td>
<td><input type="button" value="9" onclick="calculator.display.value += '9'"></td>
<td><input type="button" value="*" onclick="calculator.display.value += '*'"></td>
</tr>
<tr>
<td><input type="button" value="c" onclick="calculator.display.value = ''"></td>
<td><input type="button" value="0" onclick="calculator.display.value += '0'"></td>
<td><input type="button" value="=" onclick="calculator.display.value = eval(calculator.display.value)"></td>
<td><input type="button" value="/" onclick="calculator.display.value += '/'"></td>
</tr>
</table>
</form>
</body>
</html>